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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfa5c45d58a801bcd7cf9dff95549a4830fc4102a083d6a4cd33db1792b103c' 
  AND token = 'f5PSOW+P6V4XpDZt7BKq0jWT8B5ltB1vgMIENp5N3W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}